Upstream bug (present in pewdiepie-archdaemon/odysseus main): the task
executor passes task.endpoint_url VERBATIM to the model HTTP call, unlike
the chat path which stores build_chat_url(normalize_base(base)) on the
session. A task carrying an explicit bare OpenAI-compatible base such as
"http://host:11434/v1" therefore POSTs to a 404 ("page not found"); the
agent loop swallows the empty body into "The model returned an empty
response" and marks the run success, so nothing surfaces the failure.
Tasks that omit an endpoint dodge this only because _resolve_defaults()
cribs an already-full URL from a recent chat session. The API/token path
(e.g. an external client that POSTs /api/tasks with endpoint_url=".../v1")
hits it every time.
Fix: route every resolved task endpoint through _normalize_chat_endpoint()
at the three resolution sites (_execute_llm_task, the persona/research
session path, and _execute_research_task). The helper is idempotent
(strips any existing chat suffix, re-appends the correct one) and leaves
native-Ollama (/api...) and already-concrete URLs untouched, so other
providers are unaffected. Proven via isolated repro: ".../v1" -> 404 ->
empty; ".../v1/chat/completions" -> 200 -> real gemma4:31b output.
Regression test asserts the bare-/v1 -> full-chat-URL mapping, idempotency,
and the native-Ollama/empty passthroughs.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>